90=12t-4.9t^2

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Solution for 90=12t-4.9t^2 equation:


Simplifying
90 = 12t + -4.9t2

Solving
90 = 12t + -4.9t2

Solving for variable 't'.

Reorder the terms:
90 + -12t + 4.9t2 = 12t + -12t + -4.9t2 + 4.9t2

Combine like terms: 12t + -12t = 0
90 + -12t + 4.9t2 = 0 + -4.9t2 + 4.9t2
90 + -12t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
90 + -12t + 4.9t2 = 0.0

Begin completing the square.  Divide all terms by
4.9 the coefficient of the squared term: 

Divide each side by '4.9'.
18.36734694 + -2.448979592t + t2 = 0

Move the constant term to the right:

Add '-18.36734694' to each side of the equation.
18.36734694 + -2.448979592t + -18.36734694 + t2 = 0 + -18.36734694

Reorder the terms:
18.36734694 + -18.36734694 + -2.448979592t + t2 = 0 + -18.36734694

Combine like terms: 18.36734694 + -18.36734694 = 0.00000000
0.00000000 + -2.448979592t + t2 = 0 + -18.36734694
-2.448979592t + t2 = 0 + -18.36734694

Combine like terms: 0 + -18.36734694 = -18.36734694
-2.448979592t + t2 = -18.36734694

The t term is -2.448979592t.  Take half its coefficient (-1.224489796).
Square it (1.499375261) and add it to both sides.

Add '1.499375261' to each side of the equation.
-2.448979592t + 1.499375261 + t2 = -18.36734694 + 1.499375261

Reorder the terms:
1.499375261 + -2.448979592t + t2 = -18.36734694 + 1.499375261

Combine like terms: -18.36734694 + 1.499375261 = -16.867971679
1.499375261 + -2.448979592t + t2 = -16.867971679

Factor a perfect square on the left side:
(t + -1.224489796)(t + -1.224489796) = -16.867971679

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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